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Shirikoki 

Sex with someone's butt cheeks. Much like titty-fucking, only with butt checks instead. No penetration of the anus or vagina. Japanese word origin.
She's a virgin and kind of flat chested, so I used Shirikoki with her, she does have a fantastic big butt after all.
Shirikoki by Whiplash100 September 1, 2013
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